C. atomic number is the answer
Answer:
the answer is U shaped valley
Answer:
True
Explanation:
Precambrian, period of time extending from about 4.6 billion years ago (the point at which Earth began to form) to the beginning of the Cambrian Period, 541 million years ago. ... The Precambrian represents more than 80 percent of the total geologic record.
Element
An element is a pure substance that cannot be broken down into other substances, an element is made up of only one type of atom.
Hope this helps :)
